This is a recipe I got from a Wild Oats cayenne pepper bottle - modified for my tastes. It's easy, it's pretty, it's tasty.
2 T. extra virgin olive oil
1 celery rib, minced (I have been known to just throw in celery seed when sauté-ing the veggies if I'm out of celery.)
2 garlic cloves, minced
1 green bell pepper, thinly sliced (I have been known to substitute 1/2 medium onion if I'm out of bell pepper.)
1 1-lb 12-oz. can chopped or crushed tomatoes (chopped tomatoes makes a lighter, hot-weather-style sauce...crushed tomatoes makes a heavier, saucier sauce suited to cooler weather)
16 pimento-stuffed green olives, sliced
1 t. capers
1 t. dried basil
1/4 - 1/2 t. cayenne pepper (depends on your tastes and those of your guests...more = spicier)
1 lb. spaghetti or other long-noodle pasta
Sauté celery, garlic, and bell pepper in olive oil over medium-high heat until soft. Add tomatoes, and bring to a simmer. Add remaining ingredients, and simmer while cooking pasta according to package directions. When the pasta is done, drain it, toss with the sauce, turn into a serving bowl, and serve immediately.